[COMMIT master] KVM: SVM: Add clean-bit for control registers

[Avi Kivity]

From: Joerg Roedel <joerg.roe...@amd.com>

This patch implements the CRx clean-bit for the vmcb. This
bit covers cr0, cr3, cr4, and efer.

Signed-off-by: Joerg Roedel <joerg.roe...@amd.com>
Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2a63dfa..135727c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -192,6 +192,7 @@ enum {
        VMCB_ASID,       /* ASID */
        VMCB_INTR,       /* int_ctl, int_vector */
        VMCB_NPT,        /* npt_en, nCR3, gPAT */
+       VMCB_CR,         /* CR0, CR3, CR4, EFER */
        VMCB_DIRTY_MAX,
 };
 
@@ -441,6 +442,7 @@ static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
                efer &= ~EFER_LME;
 
        to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
+       mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
 }
 
 static int is_external_interrupt(u32 info)
@@ -1338,6 +1340,7 @@ static void update_cr0_intercept(struct vcpu_svm *svm)
                *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
                        | (gcr0 & SVM_CR0_SELECTIVE_MASK);
 
+       mark_dirty(svm->vmcb, VMCB_CR);
 
        if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
                clr_cr_intercept(svm, INTERCEPT_CR0_READ);
@@ -1404,6 +1407,7 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned 
long cr0)
         */
        cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
        svm->vmcb->save.cr0 = cr0;
+       mark_dirty(svm->vmcb, VMCB_CR);
        update_cr0_intercept(svm);
 }
 
@@ -1420,6 +1424,7 @@ static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned 
long cr4)
                cr4 |= X86_CR4_PAE;
        cr4 |= host_cr4_mce;
        to_svm(vcpu)->vmcb->save.cr4 = cr4;
+       mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
 }
 
 static void svm_set_segment(struct kvm_vcpu *vcpu,
@@ -3547,6 +3552,7 @@ static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned 
long root)
        struct vcpu_svm *svm = to_svm(vcpu);
 
        svm->vmcb->save.cr3 = root;
+       mark_dirty(svm->vmcb, VMCB_CR);
        force_new_asid(vcpu);
 }
 
@@ -3559,6 +3565,7 @@ static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned 
long root)
 
        /* Also sync guest cr3 here in case we live migrate */
        svm->vmcb->save.cr3 = vcpu->arch.cr3;
+       mark_dirty(svm->vmcb, VMCB_CR);
 
        force_new_asid(vcpu);
 }
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